He retired from Pathanamthitta on 7 June 2019 and was succeeded by Samuel Irenios Kattukallil.

Later he became parochial vicar of Venniyoor, Mulloor, Chowara, and Vizhinjam, and later still director of St. Johns Leprosy and HIV Care Services at Pirappancode.

When the Malankara Catholic Mission in North America was inaugurated, Kalloor was appointed co-ordinator and spent time ministering in the Archdiocese of Washington.

Pope John Paul II appointed Kalloor the second bishop of the Eparchy of Marthandom on 16 April 1998.

Yoohanon Mar Chrysostom was appointed the first bishop of the newly erected Eparchy of Pathanamthitta on 25 January 2010 and enthroned on 20 March 2010.